故障现象:开机无光、无声,指示灯也不亮。分析与检修:该机因本社区供电接触不良造成供电电压升高而发生“三无”故障,曾经请人维修过。三天后机主又将机器拿到我处维修。打开机器后盖检查,发现保险管严重烧黑,看来电路有严重短路现象。 Symptom: boot matt, silent, light is not bright. Analysis and Maintenance: The aircraft due to poor power supply in the community caused by increased supply voltage and the occurrence of “three no ” fault, had asked someone to repair. After three days the owner took the machine again to my office for repair. Open the machine back cover inspection and found that the fuse serious burning black, it appears that the circuit has a serious short-circuit phenomenon.